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Technical Content

Technical Abstract

Improving Sub-Messinian Images in the Nile Delta Using FWI and Least-Squares Q Migration

EAGE - European Association of Geoscientists and Engineers | Chi Chen, Huawei Gao, Xin Zhao, Zhao Wang, Jiawei Mei (CGG) ; Mark A. Benson (BP Houston) ; Bethan Turner (BP Egypt) ; Walter Rietveld (BP Exploration Ltd) ©2020 EAGE

The Messinian interval in the West Nile Delta, offshore Egypt, is a thin evaporite layer characterized by highly irregular velocities with rapid spatial variations. Its complexity poses unique challenges for sub-Messinian reservoir imaging, resulting in erratic gather curvatures, distorted structures, and nonuniform illumination. Conventional ...

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Technical Abstract

Integrated high-resolution model building: a case study from the Sultanate of Oman

EAGE - European Association of Geoscientists and Engineers | Mohammad Farooqui, Diego Carotti (CGG) ; Moosa Jahdhami (Petroleum Development Oman) ©2021 EAGE

The geology of northern Oman presents significant challenges for land velocity model building. We show in this paper that these challenges can be overcome by using an integrated high-resolution velocity model workflow, through the combination of different types of waves, that allow resolving different ...

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Technical Abstract

Joint PP-PS Inversion with Registration Optimisation to Improve Geological Knowledge of a Deep-Water Field West Africa

EAGE - European Association of Geoscientists and Engineers | Diego Lopez, Pierre Roy, Benjamin Roure (CGG) ; Anne-Sophie Barnola, Joffrey Brunellière (Total) ©2021 EAGE

Inversion has become the standard procedure to quantify elastic properties using seismic. PP seismic is commonly used for this purpose, but in areas where PP seismic is affected by gas pockets or mud volcanoes, the reflectivity can be compromised for reservoir characterization. PP-PS inversion ...

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Technical Abstract

Joint PP-PS-SS Inversion in Native Time Domain Optimizing Registration Through Travel Times Estimation

EAGE - European Association of Geoscientists and Engineers | Benjamin Roure ©2020 EAGE

Pure S-wave (SS) seismic data have the potential to bring significant uplift to seismic imaging and reservoir characterization. Combining PP, PS and/or SS data in a joint inversion for seismic reservoir characterization presents some theoretical advantages for the estimation of shear-velocity and density related ...

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Technical Abstract

Land FWI: Challenges and possibilities

EAGE - European Association of Geoscientists and Engineers | Diancheng Wang, Chi Chen, Dongping Zhuang, Jiawei Mei, Ping Wang ©2020 EAGE

Land seismic presents more and different challenges for Full-Waveform Inversion (FWI) than marine data. Among these challenges, the most fundamental ones are the irregular topography, strong nearsurface effects, and common FWI difficulties such as cycle-skipping and amplitude issues. In this work, we propose to ...

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Technical Abstract

Least-Squares Dip Angle 4D Migration for OBN and Towed Streamer Imaging

EAGE - European Association of Geoscientists and Engineers | Ross Haacke, Malgorzata Drwila, Richard Higgins, Harrison Joad (CGG) ; Steve Knapp, Christian Schiott (Hess) ; C. Hidalgo, N.Ahmad (INEOS) ©2021 EAGE

The migrated dip-angle domain provides a powerful opportunity to distinguish 4D noise from signal based on similarity filtering applied to data decomposed by position, frequency, and geological dip. However, 4D signal protection is problematic when the signal itself forms from differences between baseline and ...

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Technical Abstract

Least-squares multiple imaging constrained jointly by OBN and towed-streamer data

EAGE - European Association of Geoscientists and Engineers | Gordon Poole ©2021 EAGE

Marine seismic surveys in shallow water regions typically suffer from acquisition striping and poor shallow resolution. Multiple imaging has been discussed in the literature for several years as a processing-based approach to this problem. We compare least-squares wave-equation multiple migration (LS-WEMM) results for towed-streamer ...

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Technical Abstract

Mitigating Cycle Skipping in Full-Waveform Inversion Using Partial Matching Filters

EAGE - European Association of Geoscientists and Engineers | James Cooper, Andrew Ratcliffe, Gordon Poole ©2020 EAGE

Existing methods for addressing cycle skipping in full-waveform inversion (FWI) typically involve either a modification of one of the data sets used to compute the least-squares objective function, or a reformulation of the objective function itself, often in terms of a traveltime (or equivalent) ...

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Technical Abstract

Multi-Wave and Full-Waveform Inversion in Southern Oman

EAGE - European Association of Geoscientists and Engineers | Sylvain Masclet, Guillaume Bouquard, Herve Prigent ©2020 EAGE

With a shallow anhydrite layer, strong multiples and converted wave contamination, Southern Oman represents an outstanding challenge for land velocity model building and imaging. While acoustic land full-waveform inversion (FWI) has proved successful on new broadband datasets in Northern Oman, no successful application has ...

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